<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>


            /* 1 *  容器 */
            .container{
                width: 100vw;
                height: 100vh;
                display: flex;
                justify-content: center;
                align-items: center;

            }

            .formlogin{
                width: 300px;
                height: 300px;
                border: solid 0.2px grey;
                border-radius: 10px;
                box-shadow: 0 0  10px red;

            }

    </style>
</head>
<body>
    

    <div class="container">

        <div class="formlogin">


        </div>


    </div>




</body>
</html>